Aliens vs. Predator: Extinction

Enable cheat mode. With a help of the Drone, start a Queen's Nest.
Before you have her lay eggs, set her to "No attack" and get the
maximum units that you can have (43 eggs, the Drone and the Queen).
With the Drone, arrange the eggs in a way you can see all of them in
the viewport (screen). Select all eggs and hatch them. The
PlayStation2 will freeze on a blue screen.

Press Start to pause game play in a campaign, then press R1(2), L1,
R1, L1(2), R1, L1, R1(2), L1, R1, L1(2), R1, L1 to unlock the
"Cheats" selection at the options menu. The cheat options include
"Toggle Unit Spying", "Cheat Win", "Gimme $10000", "Show LZs",
"Player Invulnerable", "Enable All Levels", and "Clear Fog Of War".
Alternatively, get the all gold medals in the game to unlock the same
options.

On the last Alien mission, enable cheat code and activate the
"Toggle Unit Spying" and "Clear Fog Of War" cheats. The Predators on
the level should show up as blue and the Marines should show up as
the predator color on your mini-map.